Ultima III

Consumes much less CPU.
Sounds play asynchronously when appropriate.
Preferences dialog "Cancel" button actually cancels, and defaults buttons work properly.
Keystroke buffer now cleared properly at the same times as the Classic version (such as at the beginning of combat).
The window you get from trying to quit while unable to save no longer interprets the ESC key as "Quit Anyway".
Experience points bar now updates instantly when points earned.
Mouse-based interface now works in Ambrosia.
Oracle in Lord British's castle now doesn't effectively lock up the game.
"About Ultima III" window now placed properly.